Physics – Quantum Physics
Scientific paper
2010-03-23
J. Math. Phys 51, 082105 (2010)
Physics
Quantum Physics
23 pages, 5 figures, minor update
Scientific paper
10.1063/1.3479748
It is well-known that a quantum measurement can enhance the transition probability between two quantum states. Such a measurement operates after preparation of the initial state and before postselecting for the final state. Here we analyze this kind of scenario in detail and determine which probability distributions on a finite number of outcomes can occur for an intermediate measurement with postselection, for given values of the following two quantities: (i) the transition probability without measurement, (ii) the transition probability with measurement. This is done for both the cases of projective measurements and of generalized measurements. Among other constraints, this quantifies a trade-off between high randomness in a projective measurement and high measurement-modified transition probability. An intermediate projective measurement can enhance a transition probability such that the failure probability decreases by a factor of up to 2, but not by more.
No associations
LandOfFree
Transition probabilities and measurement statistics of postselected ensembles does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Transition probabilities and measurement statistics of postselected ensembles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transition probabilities and measurement statistics of postselected ensembles will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-211686